1. Open Access Defined world-wide electronic distribution of the peer-reviewed journal literature, completely free and unrestricted access to it by all scientists, scholars, teachers, students, and other curious minds. (http://www.library.cornell.edu)

2. http://pqdtopen.proquest.com/ 3. http://www.gutenberg.org/ 4. http://www.intechopen.com 5. http://www.getfreeebooks.com 6. http://www.globusz.com/ 7. http://www.planetebook.com 8. http://bookboon.com/ 9. http://www.doaj.org/ 10. http://www.eric.ed.gov/ 11. http://www.turnit.com 12. http://www.mainlib.upd.edu.ph